Confirmed varieties of 40th anniversary of 1st Cavalery

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In 1959, the Soviet Union issued a series of stamps commemorating the 40th anniversary of the First Cavalry Army, a famed cavalry unit of the Red Army that played a significant role during the Russian Civil War. The design of the stamp series often features imagery inspired by a painting of trumpeters of the First Cavalry, capturing the momentum and heroic spirit of this famed military formation.

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These anniversary issues in the late 1950s were part of the USSR’s broader effort to celebrate and preserve the memory of pivotal moments in early Soviet history. The stamps were released in December 1959 and hold value for both postal use and as collectible items reflecting an important 40-year milestone since the formation of the cavalry unit.

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Confirmed varieties of stamps of 40th anniversary of 1st Cavalery

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1. dark blue spot in the left top corner of picture ???